DE2847248C2

DE2847248C2 - Speed controller for a fuel injection pump of an internal combustion engine

Info

Publication number: DE2847248C2
Application number: DE19782847248
Authority: DE
Inventors: Konrad Dipl.-Ing. Dr. 7000 Stuttgart Eckert
Original assignee: Robert Bosch GmbH
Current assignee: Robert Bosch GmbH
Priority date: 1978-10-31
Filing date: 1978-10-31
Publication date: 1986-12-04
Also published as: DE2847248A1; JPS6316575B2; JPS5560629A; GB2035621A; GB2035621B

Description

versteller 2 angetrieben, der über einen Regelhebel 3 und einen Zwischenhebel 4 die als Mengensteuerglied dienende Regelstange 5 der Einspritzpumpe betätigt Der Fliehkraftversteller arbeitet mit Fliehgewichten 6, die entgegen einer Rückstellfeder 7 ein Stellglied 8 beta- s tigen, welches mindestens mittelbar mit dem Regelhebel 3 verbunden ist und an welchem deF Anker 9 eines Hubgebers 10 befestigt ist Auf dem Anker 9 ist ein ferro magnetischer Kern 11 angeordnet, um den herum im Gebergehäuse zwei Induktionsspulen 12 axial nebeneinander angeordnet sind, so daß durch die Verschiebung der Lage des Ankers 9 eine entsprechende Spannungsänderung im elektronischen Regler bewirkt wird. Hierdurch ist die Lage des Ankers 9 und damit des Stellgliedes 8 bestimmbar, wobei jede Lage aufgrund is der Fliehkraftverstellung einer bestimmten Drehzahl entspricht Der Geber 10 ist über elektrische Leitungen 13 mit einem Stecker 14 verbunden, von dem dann ein entsprechendes, nicht dargestelltes Kabel zu einem elektronischen Steuergerät führtadjuster 2 driven, which is controlled via a control lever 3 and an intermediate lever 4 actuates the control rod 5 of the injection pump, which serves as a quantity control element The centrifugal adjuster works with centrifugal weights 6 which, against a return spring 7, betas an actuator 8 term, which is at least indirectly connected to the control lever 3 and to which deF anchor 9 a Stroke encoder 10 is attached to the armature 9, a ferromagnetic core 11 is arranged around the two induction coils 12 are arranged axially next to one another in the transmitter housing, so that the displacement the position of the armature 9 causes a corresponding voltage change in the electronic controller will. As a result, the position of the armature 9 and thus of the actuator 8 can be determined, each position being based on the centrifugal adjustment corresponds to a certain speed. The encoder 10 is via electrical lines 13 connected to a plug 14, from which then a corresponding cable, not shown, to a electronic control unit leads

Das Stellglied 8 greift über ein Schleppglied 15 am Regelhebei 3 an, wobei zwischen Stellglied 8 und Schleppglied 15 eine Schleppfeder 16 vorgesehen ist Die Verwendung eines Schleppgliedes ist lediglich reglerauslegungsabhängig, jedoch für die grundsätzliche Funktion des hier beschriebenen Reglers nicht erforderlich. Der Regelhebel 3 ist in einem Lagerpunkt 16a gehalten und bei 17 gelenkig mit dem Zwischenhebel 4 verbunden. Der Lagerpunkt 16a ist bezüglich seiner Lage über einen Hubmagneten 18 änderbar, bei dem ein Anker 19 in eine Spule 20 entgegen einer Feder 21 ziehbar ist, wobei über einen Winkelhebel 22, der bei 23 gelagert ist, der Lagerpunkt 16a verschoben wird. Der Grad der Verstellung wird über einen Hubgeber 24 gemessen, der durch den Winkelhebel 22 entgegen einer Feder 25 verschiebbar ist, wobei ein Anker 26 in Spulen 27 taucht Der Aufbau des Gebers 24 entspricht im Prinzip dem Aufbau des Gebers 10. Die Spannungszuführung zur Spule 20 sowie die Meßwertweiterleitung des Gebers 24 erfolgt über elektrische Leitungen 28, die in einem Stecker 29 enden, welcher mit dem nicht dargestellten Steuergerät verbunden istThe actuator 8 engages via a drag link 15 on the Regelhebei 3, with between actuator 8 and Drag link 15 a drag spring 16 is provided The use of a drag link is only dependent on the controller design, however not required for the basic function of the controller described here. The control lever 3 is held in a bearing point 16a and is articulated at 17 with the intermediate lever 4 tied together. The position of the bearing point 16a can be changed by means of a lifting magnet 18, in which a Armature 19 can be pulled into a coil 20 against a spring 21, with an angle lever 22, which is at 23 is stored, the bearing point 16a is moved. Of the The degree of adjustment is measured via a stroke transmitter 24, which is counteracted by the angle lever 22 Spring 25 is displaceable, with an armature 26 dipping into coils 27. The structure of the transmitter 24 corresponds in principle the structure of the encoder 10. The voltage supply to the coil 20 as well as the measured value forwarding of the Encoder 24 takes place via electrical lines 28 which end in a plug 29 which is connected to the not shown Control unit is connected

Damit der Regler die Drehzahl in gewünschter Weise konstant hält bzw. einen ganz geringen Proportionalitätsgrad aufweist, muß der Geber 10, d. h. das Stellglied 8, auch bei sich ändernder Belastung immer die gleiche Stellung einnehmen, da jeder Stellung eine bestimmte Drehzahl entspricht Sobald sich also aufgrund irgendwelcher Ursachen, z. B. Temperatur oder Belastung, die vorgewählte Drehzahl ändert, wird aufgrund des sich so ergebenden Änderungssignals des Gebers 10 im elektronischen Steuergerät ein entsprechendes Ausgangssignal gebildet, über das der Magnet 18 eine Verstellung des Lagerpunktes 16a bewirkt, der eine entsprechende Verschiebung der Regelstange 5 zur Folge hat, wodurch die Einspritzmenge so zu- oder abnimmt, daß die gewünschte Solldrehzahl erreicht wird. Der Regler arbeitet dann nach dem Integral-Differenzial-Prinzip, wobei die Stabilisierung über die Rückführung erreicht wird, die der Geber 24 für die Stellung des Winkelhebels er-So that the controller keeps the speed constant in the desired manner or a very low degree of proportionality has, the encoder 10, i. H. the actuator 8, even when the load changes, always the same Take a position, since each position corresponds to a certain speed Causes, e.g. B. temperature or load, the preselected speed changes, due to the so resulting change signal of the encoder 10 in the electronic control unit a corresponding output signal formed, via which the magnet 18 causes an adjustment of the bearing point 16a, which has a corresponding Shifting the control rod 5 has the consequence, whereby the injection quantity increases or decreases so that the desired Target speed is reached. The controller then works on the integral-differential principle, whereby the stabilization is achieved via the feedback that the encoder 24 for the position of the angle lever

gnal ein Maß für die Geschwindigkeit der Stellbewegung der den Geber betätigenden Teile ist Durch weitere Differenzierung läßt sich die Beschleunigung der Teile messen.gnal is a measure of the speed of the positioning movement of the parts actuating the transmitter. Through further differentiation, the acceleration of the Measure parts.

Statt eines Hubmagneten 18 kann natürlich auch eine andere Art von Stellwerk dienen. Das gleiche gilt für den Geber 24, der entsprechend dem Stellwerk ausgebildet sein muß.Instead of a lifting magnet 18, another type of interlocking can of course also be used. The same applies the encoder 24, which must be designed according to the signal box.

Die Spannung von den Gebern 10 und 24 kann vorteilhafterweise zur Stabilisierung des Regelkreises verwendet werden, da insbesondere für differenziertes Si-The voltage from the sensors 10 and 24 can advantageously be used to stabilize the control loop because especially for differentiated Si

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65 Hierzu 1 Blatt Zeichnungen 65 1 sheet of drawings

Claims

1 2 shaft is the speed measurement with such inductive patent claims: bern, which work together with rotating gears, because of the rotational irregularities and the

1. Speed controller for a fuel injection pump due to the large amount of electronics required pe of an internal combustion engine, with one for s to eliminate the rotational irregularities Pump speed proportionally driven centrifugal signal deviations very complicated Force adjusters, on the contrary, flyweights are cheap and expensive. In addition, the installation of the inductive test requires a restoring force actuate an actuator, ven speed sensor, which is expediently in rotation over which is arranged with the interposition of at least number regulators, a corresponding distinction Control lever a quantity control element shifting and special construction of the speed adjustable is, and with a via an adjusting lever the position lers. So is one in a centrifugal governor Bearing point of the control lever correcting, builder and together with a rotating gear an electronic control unit connected working inductive speed sensor also from the electric servomotor, thereby marked- US-PS 3841 285 known, whose speed signals ever draws, that to record the actual speed the 15 are used for other tasks, e.g. B. to control egg lifting movement of the actuator (8) by means of an automatic gearbox or an anti-lock sensor (10) measured and stone in the control unit.

will give. The object of the present invention now exists

2. Speed controller according to claim 1, with on induk- therein, with a speed controller of the generic type tive way of speed measurement, thereby the actual speed of the centrifugal adjuster with in characterized in that the stroke encoder (10) as an inductive structure and function extremely simple means to mesgeber is designed in which one of the actuator (8) sen or to be detected, in particular also a displaceable armature (9) in at least one induction retrofit of a commercially available flywheel coil (12) dives. Kraftdrehzaitilreglers be possible in a simple manner

3. Speed controller according to claim 1 or 2, there should be 25.

characterized in that the armature (9) consists of a. This object is achieved according to the invention with the im

Core (II) ferromagnetic material consists of the characterizing part of claim 1 specified

4. Speed controller according to claim 2 or 3, there features solved

characterized in that two induction coils In the speed controller according to the invention, al-

(12) one behind the other in the axial direction of the armature (9) so as to detect the actual speed, e.g. B. to realize

are arranged. an isodrome control, the stroke movement of the

5. Speed controller according to one of claims 1 to the actuator moved by the centrifugal adjuster gemes-4, characterized in that the adjusting movement sen by means of one in its structure and its of the electric servomotor (magnet 18) via an extremely simple stroke encoder function, which is particularly second stroke transmitter (24) tapped and measured 35 can be manufactured inexpensively. Such a will. Place the stroke encoder in a spatially favorable manner and, in particular,

6. Speed controller according to claim 5, characterized in that it is easy and uncomplicated to switch off and on repairs indicates that the measuring signal of the incorporate the actuator. Last but not least, such a transmitter can be started (8) attach the associated stroke sensor (10) or the standard centrifugal governor, at degnale this (10) as well as the second handler (24), 40 NEN from the start not to an electrical intervention especially after their differentiation, was intended to stabilize. This can be used in particular for a verse of the control loop. Turn as an isodrome regulator a mass-produced one Centrifugal governor retrofitted

be steadily.

45 Although stroke encoders of various types are known, there is a particularly advantageous design

The invention is based on a speed controller device of the subject invention, if according to Annach the generic preamble of patent claim 2 in the main claim according to the speed claim 1. controller, in which now, as mentioned in the

Well known to the increasing demands on the rule quality patent specification, the speed measurement on inlity of a speed controller, especially if it is to be done in a ductile way, the stroke encoder according to an isodrome controller with a particularly low, characterizing part of patent claim 2 as inductive, possibly zero percent Proportionalitäts- ber or inductive displacement sensor is formed.
degree acts, it is necessary to use electrically controlled Further advantageous embodiments of the invention

Subclaims 3 to 6 relate to the subclaims 3 to 6 to provide connections for the speed controller electrically in the with a centrifugal adjuster, with the mark according to the To intervene. One of the prerequisites for the features of claim 5 is the actuating movement of the the implementation of such interventions is a suitable electric servomotor tapping or measuring and in particular inexpensive speed encoder for the second stroke encoder a quickly responding isodrome mount or measurement of the respective existing actual speed control to achieve a proportionality figure of p.uH percent can be achieved by the im

From GB-PS 14 00 299 a speed controller of the characterizing part of claim 6 specified features according to the generic Design known, the stabilization of the control loop can be achieved at once, electrical connection provided centrifugal rotation An embodiment of the subject matter of the invention

The number controller is designed and for speed detection 65 training is shown in greatly simplified form in the drawing and has an inductive speed sensor because of the and is explained in more detail below:
In the case of fuel injection pumps, non-uniform rotation- By the camshaft 1 a not shown

movement of the drive, which is designed as a camshaft, is a centrifugal force